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Re:How I Wished My Best Customers on Their Birthdays by mburney on Monday March 14, 2011 @11:17AM (#2322794)
A few ways:

-Ask them when they are inputting in any kind of sign up form for your product (if you have one). Probably best to make it an optional field though

-Mine the data using facebook (if your clients are on your facebook list)

-Send out a survey with some incentive, and with some q's that would gain some knowledge about them plus their date of birth

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